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Finding the Fourth Proportional to 128,420.60, 177,303.60 and 114,968.64

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Solution

The fourth proportional to 128,420.60, 177,303.60 and 114,968.64 is: 158,731.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.60 : 177,303.60 = 114,968.64 : x
  2. Step 2: Convert to fraction form
    128,420.60/177,303.60 = 114,968.64/x
  3. Step 3: Cross multiply
    128,420.60x = 177,303.60 × 114,968.64
  4. Step 4: Simplify right side
    128,420.60x = 20,384,353,759.10
  5. Step 5: Solve for x
    x = 20,384,353,759.10/128,420.60
  6. Step 6: Final answer
    x = 158,731.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.